JoeShep · October 17, 2016 22:19
diff --git a/index.html b/index.html
 <!doctype html>

 <html lang="en">
 <head>
  <meta charset="utf-8">
  <title>Nashville Software School</title>
  <link rel="stylesheet" type="text/css" href="events.css">
 </head>

 <body>
  <div id="wrapper">
    <header id="page-header">
      <h1 id="page-title">Page title</h1>
    </header>

    <ul class="my-list">
      <li>hi there</li>
    </ul>

    <article>
      <section class="article-section">Introduction</section>
      <section class="article-section">Body</section>
      <section class="article-section">Conclusion</section>
    </article>

    <input type="text" id="keypress-input">

    <div id="output-target"></div>

    <div id="guinea-pig">Leave me alone</div>

    <div id="card--1">
      <button id="add-color">Add color</button>
    </div>

    <button id="make-large">Hulkify</button>
    <button id="add-border">Capture it</button>
    <button id="add-rounding">Rounded</button>
  </div>
  <script type="text/javascript" src="eventHandlers.js"></script>

 </body>
 </html>
diff --git a/listeners.js b/listeners.js
 var outputEl = document.getElementById("output-target");

 /*
  You can get a reference to DOM elements and
  directly attach an event handler. In this
  example, we get every element with a class of
  "article-section" and listen for when the
  user clicks on the element. When that event
  fires, the attached "handleSectionClick"
  function gets executed.
 */

 var articleEl = document.getElementsByClassName("article-section");
 console.log("articleEl",articleEl);

 function handleSectionClick(MouseEvent) {
  console.log(MouseEvent);
  var elementText = MouseEvent.target.innerHTML;
  outputEl.innerHTML = "You clicked on the " + elementText + " section";
 }

 for (var i = 0; i < articleEl.length; i++) {
  articleEl.item(i).addEventListener("click", handleSectionClick);
 }

 /*
  Get a reference to the DOM element with an id of
  "page-header", and attach an event handler for the
  mouseover, and mouseout, events. Log some message
  to the console for each.
 */
 var header = document.getElementById("page-header");

 function handleHeaderMouseOver(event) {
  outputEl.innerHTML ="You moved your mouse over me";
 }

 function handleHeaderMouseOut(event) {
  outputEl.innerHTML = "Why u leave me?";
 }

 header.addEventListener("mouseover", handleHeaderMouseOver);
 header.addEventListener("mouseout", handleHeaderMouseOut);


 /*
  We can also write an anonymous function (lamba expression)
  in the addEventListener declaration instead of using a
  function reference
 */
 var fieldEl = document.getElementById("keypress-input");

 fieldEl.addEventListener("keyup", function (event) {
  console.log("event",event);
  outputEl.innerHTML = event.target.value;
 });

 var guineaPig = document.getElementById("guinea-pig");

 document.getElementById("add-color")
  .addEventListener("click", function() {
  guineaPig.classList.toggle("blue");
 });

 document.getElementById("make-large")
  .addEventListener("click", function() {
  guineaPig.classList.toggle("large");
 });

 document.getElementById("add-border")
  .addEventListener("click", function() {
  guineaPig.classList.toggle("bordered");
 });

 document.getElementById("add-rounding")
  .addEventListener("click", function() {
  guineaPig.classList.toggle("rounded");
 });


 /*
  EVENT BUBBLING:

  You can add an event handler on the body tag, and since all
  browser events bubble up to the body, you can then put in
  conditional logic to handle the click event on many different
  elements in one function.
 */
 document.getElementById("card--1").addEventListener("click", function(event) {
  console.log("target", event.target);
  console.log("currentTarget", event.currentTarget);

  Handle the click event on any li
  if (event.target.tagName.toLowerCase() === "li") {
    console.log("You clicked on an <li> element");
  }

  Handle the click event on any section
     * Notice how when you click on a section, it executes
       this code, but *also* the code on line 17.
  if (event.target.className === "article-section") {
    console.log("You clicked on an `article-section` element");
  }

  Inspect the `id` property of the event target
  if (event.target.id === "page-title") {
    console.log("You clicked on the page-title element");
  }
 });
	<!doctype html>

	<html lang="en">
	<head>
	<meta charset="utf-8">
	<title>Nashville Software School</title>
	<link rel="stylesheet" type="text/css" href="events.css">
	</head>

	<body>
	<div id="wrapper">
	<header id="page-header">
	<h1 id="page-title">Page title</h1>
	</header>

	<ul class="my-list">
	<li>hi there</li>
	</ul>

	<article>
	<section class="article-section">Introduction</section>
	<section class="article-section">Body</section>
	<section class="article-section">Conclusion</section>
	</article>

	<input type="text" id="keypress-input">

	<div id="output-target"></div>

	<div id="guinea-pig">Leave me alone</div>

	<div id="card--1">
	<button id="add-color">Add color</button>
	</div>

	<button id="make-large">Hulkify</button>
	<button id="add-border">Capture it</button>
	<button id="add-rounding">Rounded</button>
	</div>
	<script type="text/javascript" src="eventHandlers.js"></script>

	</body>
	</html>
	var outputEl = document.getElementById("output-target");

	/*
	You can get a reference to DOM elements and
	directly attach an event handler. In this
	example, we get every element with a class of
	"article-section" and listen for when the
	user clicks on the element. When that event
	fires, the attached "handleSectionClick"
	function gets executed.
	*/

	var articleEl = document.getElementsByClassName("article-section");
	console.log("articleEl",articleEl);

	function handleSectionClick(MouseEvent) {
	console.log(MouseEvent);
	var elementText = MouseEvent.target.innerHTML;
	outputEl.innerHTML = "You clicked on the " + elementText + " section";
	}

	for (var i = 0; i < articleEl.length; i++) {
	articleEl.item(i).addEventListener("click", handleSectionClick);
	}

	/*
	Get a reference to the DOM element with an id of
	"page-header", and attach an event handler for the
	mouseover, and mouseout, events. Log some message
	to the console for each.
	*/
	var header = document.getElementById("page-header");

	function handleHeaderMouseOver(event) {
	outputEl.innerHTML ="You moved your mouse over me";
	}

	function handleHeaderMouseOut(event) {
	outputEl.innerHTML = "Why u leave me?";
	}

	header.addEventListener("mouseover", handleHeaderMouseOver);
	header.addEventListener("mouseout", handleHeaderMouseOut);


	/*
	We can also write an anonymous function (lamba expression)
	in the addEventListener declaration instead of using a
	function reference
	*/
	var fieldEl = document.getElementById("keypress-input");

	fieldEl.addEventListener("keyup", function (event) {
	console.log("event",event);
	outputEl.innerHTML = event.target.value;
	});

	var guineaPig = document.getElementById("guinea-pig");

	document.getElementById("add-color")
	.addEventListener("click", function() {
	guineaPig.classList.toggle("blue");
	});

	document.getElementById("make-large")
	.addEventListener("click", function() {
	guineaPig.classList.toggle("large");
	});

	document.getElementById("add-border")
	.addEventListener("click", function() {
	guineaPig.classList.toggle("bordered");
	});

	document.getElementById("add-rounding")
	.addEventListener("click", function() {
	guineaPig.classList.toggle("rounded");
	});


	/*
	EVENT BUBBLING:

	You can add an event handler on the body tag, and since all
	browser events bubble up to the body, you can then put in
	conditional logic to handle the click event on many different
	elements in one function.
	*/
	document.getElementById("card--1").addEventListener("click", function(event) {
	console.log("target", event.target);
	console.log("currentTarget", event.currentTarget);

	Handle the click event on any li
	if (event.target.tagName.toLowerCase() === "li") {
	console.log("You clicked on an <li> element");
	}

	Handle the click event on any section
	* Notice how when you click on a section, it executes
	this code, but also the code on line 17.
	if (event.target.className === "article-section") {
	console.log("You clicked on an `article-section` element");
	}

	Inspect the `id` property of the event target
	if (event.target.id === "page-title") {
	console.log("You clicked on the page-title element");
	}
	});